Gas Furnace Vent Pipe Leaking Rain Water

The flashing and vent pipe entry was sealed right.

Gas furnace vent pipe leaking rain water.

First off conventional furnaces were not designed to produce water of any kind. Why a high efficiency furnace creates condensation how in the heck does a high efficiency furnace create condensation water anyway. There are two main issues that can cause your conventional furnace to drip water. Gas furnace leaking water from evaporator coil.

This is typically flown out of a pvc pipe that comes from the furnace and drains into the floor drain in your furnace room. The yellow energy guide tag says your furnace s efficiency is 90 or higher afue. When your roof was installed each vent pipe received a flexible boot to seal water around the round surface of the vent pipe. I have a storm collar and a high wind storm cap.

Dura vent makes a cap called the brider cap that works very well and is not as open as your current cap. Here s what to look for. B vent is a good low mass system when properly laid out and installed. Vent pipe leaks during heavy rain can occur if you have cracks in your vent pipe boot or flashing.

If water does enter the combustion air pipe there should be a tee installed at distinct locations to prevent water from entering and leaking from the furnace. The vent flue pipe is white pvc as opposed to metal. Poorly designed exhaust pipe. These boots vary in quality flexibility and longevity.

So if it is dripping water you should have a professional inspect the unit immediately. High efficiency furnaces those with an annual fuel utilization efficiency afue rating of 90 percent or higher have cool exhaust and as a result they produce condensation. There could be a few reasons why your furnace is leaking water but let s start with the most likely one. The evaporator coil is the indoor coil for air conditioning.

And over time many vent pipe boots get hard and brittle as. However if this tube becomes clogged or if the drain on your floor becomes it can cause water to backup and leak out of the furnace. No water was coming from the flashing or above the first flue seam inside the attic i e. An easy way to tell if you have a high efficiency furnace is to look at.

Where my gas furnace flue pipe type b runs through my attic i had water dripping from the connections seams in the area where it makes a 45 degree bend water was inside the pipe from blown rain. An upflow gas furnace will have the evaporator coil installed on top of it. Every system will have certain wet time when the flue is cold er and will produce condensate until the flue warms up. If your furnace exhaust pipe or flue pipe is leaking it can be a sign of a much bigger problem.

You ll know if you have a high efficiency furnace if. When the roof vent is leaking the actual cause must be identified first. Other causes of leaking roof vent are including broken seams on the metal base loosen nails and rusty metal collars around the vent pipe.